I have 6 of these left to do. 1.A barrel of water weighs 20 pounds. What do you have to add to it to make it weigh 12 pounds? 2.What happened in the middle of the 20th century that will not happen again for 4,000 years? 3.The more you have of it, the less you see. What is it? 4.The more you take the more you leave behind. What are they? 5.The one who makes it, sells it, the one who buys it never uses it, they one who uses it never knows he is using it it. What is it? 6. What unusual natural phenomenon is capable of speaking in any language? I have a couple of ideas but am not sure. Any help gratefully received. THANK YOU.